Thu, 07 Feb 2013 16:05:48 -0500
Merge
1 /*
2 * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
25 #include "precompiled.hpp"
26 #include "classfile/classLoaderData.hpp"
27 #include "classfile/javaClasses.hpp"
28 #include "classfile/metadataOnStackMark.hpp"
29 #include "classfile/symbolTable.hpp"
30 #include "classfile/systemDictionary.hpp"
31 #include "classfile/vmSymbols.hpp"
32 #include "interpreter/linkResolver.hpp"
33 #include "memory/heapInspection.hpp"
34 #include "memory/metadataFactory.hpp"
35 #include "memory/oopFactory.hpp"
36 #include "oops/constantPool.hpp"
37 #include "oops/instanceKlass.hpp"
38 #include "oops/objArrayKlass.hpp"
39 #include "runtime/fieldType.hpp"
40 #include "runtime/init.hpp"
41 #include "runtime/javaCalls.hpp"
42 #include "runtime/signature.hpp"
43 #include "runtime/vframe.hpp"
45 ConstantPool* ConstantPool::allocate(ClassLoaderData* loader_data, int length, TRAPS) {
46 // Tags are RW but comment below applies to tags also.
47 Array<u1>* tags = MetadataFactory::new_writeable_array<u1>(loader_data, length, 0, CHECK_NULL);
49 int size = ConstantPool::size(length);
51 // CDS considerations:
52 // Allocate read-write but may be able to move to read-only at dumping time
53 // if all the klasses are resolved. The only other field that is writable is
54 // the resolved_references array, which is recreated at startup time.
55 // But that could be moved to InstanceKlass (although a pain to access from
56 // assembly code). Maybe it could be moved to the cpCache which is RW.
57 return new (loader_data, size, false, THREAD) ConstantPool(tags);
58 }
60 ConstantPool::ConstantPool(Array<u1>* tags) {
61 set_length(tags->length());
62 set_tags(NULL);
63 set_cache(NULL);
64 set_reference_map(NULL);
65 set_resolved_references(NULL);
66 set_operands(NULL);
67 set_pool_holder(NULL);
68 set_flags(0);
70 // only set to non-zero if constant pool is merged by RedefineClasses
71 set_version(0);
72 set_lock(new Monitor(Monitor::nonleaf + 2, "A constant pool lock"));
74 // initialize tag array
75 int length = tags->length();
76 for (int index = 0; index < length; index++) {
77 tags->at_put(index, JVM_CONSTANT_Invalid);
78 }
79 set_tags(tags);
80 }
82 void ConstantPool::deallocate_contents(ClassLoaderData* loader_data) {
83 MetadataFactory::free_metadata(loader_data, cache());
84 set_cache(NULL);
85 MetadataFactory::free_array<jushort>(loader_data, operands());
86 set_operands(NULL);
88 release_C_heap_structures();
90 // free tag array
91 MetadataFactory::free_array<u1>(loader_data, tags());
92 set_tags(NULL);
93 }
95 void ConstantPool::release_C_heap_structures() {
96 // walk constant pool and decrement symbol reference counts
97 unreference_symbols();
99 delete _lock;
100 set_lock(NULL);
101 }
103 objArrayOop ConstantPool::resolved_references() const {
104 return (objArrayOop)JNIHandles::resolve(_resolved_references);
105 }
107 // Create resolved_references array and mapping array for original cp indexes
108 // The ldc bytecode was rewritten to have the resolved reference array index so need a way
109 // to map it back for resolving and some unlikely miscellaneous uses.
110 // The objects created by invokedynamic are appended to this list.
111 void ConstantPool::initialize_resolved_references(ClassLoaderData* loader_data,
112 intStack reference_map,
113 int constant_pool_map_length,
114 TRAPS) {
115 // Initialized the resolved object cache.
116 int map_length = reference_map.length();
117 if (map_length > 0) {
118 // Only need mapping back to constant pool entries. The map isn't used for
119 // invokedynamic resolved_reference entries. The constant pool cache index
120 // has the mapping back to both the constant pool and to the resolved
121 // reference index.
122 if (constant_pool_map_length > 0) {
123 Array<u2>* om = MetadataFactory::new_array<u2>(loader_data, map_length, CHECK);
125 for (int i = 0; i < constant_pool_map_length; i++) {
126 int x = reference_map.at(i);
127 assert(x == (int)(jushort) x, "klass index is too big");
128 om->at_put(i, (jushort)x);
129 }
130 set_reference_map(om);
131 }
133 // Create Java array for holding resolved strings, methodHandles,
134 // methodTypes, invokedynamic and invokehandle appendix objects, etc.
135 objArrayOop stom = oopFactory::new_objArray(SystemDictionary::Object_klass(), map_length, CHECK);
136 Handle refs_handle (THREAD, (oop)stom); // must handleize.
137 set_resolved_references(loader_data->add_handle(refs_handle));
138 }
139 }
141 // CDS support. Create a new resolved_references array.
142 void ConstantPool::restore_unshareable_info(TRAPS) {
144 // restore the C++ vtable from the shared archive
145 restore_vtable();
147 if (SystemDictionary::Object_klass_loaded()) {
148 // Recreate the object array and add to ClassLoaderData.
149 int map_length = resolved_reference_length();
150 if (map_length > 0) {
151 objArrayOop stom = oopFactory::new_objArray(SystemDictionary::Object_klass(), map_length, CHECK);
152 Handle refs_handle (THREAD, (oop)stom); // must handleize.
154 ClassLoaderData* loader_data = pool_holder()->class_loader_data();
155 set_resolved_references(loader_data->add_handle(refs_handle));
156 }
158 // Also need to recreate the mutex. Make sure this matches the constructor
159 set_lock(new Monitor(Monitor::nonleaf + 2, "A constant pool lock"));
160 }
161 }
163 void ConstantPool::remove_unshareable_info() {
164 // Resolved references are not in the shared archive.
165 // Save the length for restoration. It is not necessarily the same length
166 // as reference_map.length() if invokedynamic is saved.
167 set_resolved_reference_length(
168 resolved_references() != NULL ? resolved_references()->length() : 0);
169 set_resolved_references(NULL);
170 set_lock(NULL);
171 }
173 int ConstantPool::cp_to_object_index(int cp_index) {
174 // this is harder don't do this so much.
175 for (int i = 0; i< reference_map()->length(); i++) {
176 if (reference_map()->at(i) == cp_index) return i;
177 // Zero entry is divider between constant pool indices for strings,
178 // method handles and method types. After that the index is a constant
179 // pool cache index for invokedynamic. Stop when zero (which can never
180 // be a constant pool index)
181 if (reference_map()->at(i) == 0) break;
182 }
183 // We might not find the index.
184 return _no_index_sentinel;
185 }
187 Klass* ConstantPool::klass_at_impl(constantPoolHandle this_oop, int which, TRAPS) {
188 // A resolved constantPool entry will contain a Klass*, otherwise a Symbol*.
189 // It is not safe to rely on the tag bit's here, since we don't have a lock, and the entry and
190 // tag is not updated atomicly.
192 CPSlot entry = this_oop->slot_at(which);
193 if (entry.is_resolved()) {
194 assert(entry.get_klass()->is_klass(), "must be");
195 // Already resolved - return entry.
196 return entry.get_klass();
197 }
199 // Acquire lock on constant oop while doing update. After we get the lock, we check if another object
200 // already has updated the object
201 assert(THREAD->is_Java_thread(), "must be a Java thread");
202 bool do_resolve = false;
203 bool in_error = false;
205 // Create a handle for the mirror. This will preserve the resolved class
206 // until the loader_data is registered.
207 Handle mirror_handle;
209 Symbol* name = NULL;
210 Handle loader;
211 { MonitorLockerEx ml(this_oop->lock());
213 if (this_oop->tag_at(which).is_unresolved_klass()) {
214 if (this_oop->tag_at(which).is_unresolved_klass_in_error()) {
215 in_error = true;
216 } else {
217 do_resolve = true;
218 name = this_oop->unresolved_klass_at(which);
219 loader = Handle(THREAD, this_oop->pool_holder()->class_loader());
220 }
221 }
222 } // unlocking constantPool
225 // The original attempt to resolve this constant pool entry failed so find the
226 // original error and throw it again (JVMS 5.4.3).
227 if (in_error) {
228 Symbol* error = SystemDictionary::find_resolution_error(this_oop, which);
229 guarantee(error != (Symbol*)NULL, "tag mismatch with resolution error table");
230 ResourceMark rm;
231 // exception text will be the class name
232 const char* className = this_oop->unresolved_klass_at(which)->as_C_string();
233 THROW_MSG_0(error, className);
234 }
236 if (do_resolve) {
237 // this_oop must be unlocked during resolve_or_fail
238 oop protection_domain = this_oop->pool_holder()->protection_domain();
239 Handle h_prot (THREAD, protection_domain);
240 Klass* k_oop = SystemDictionary::resolve_or_fail(name, loader, h_prot, true, THREAD);
241 KlassHandle k;
242 if (!HAS_PENDING_EXCEPTION) {
243 k = KlassHandle(THREAD, k_oop);
244 // preserve the resolved klass.
245 mirror_handle = Handle(THREAD, k_oop->java_mirror());
246 // Do access check for klasses
247 verify_constant_pool_resolve(this_oop, k, THREAD);
248 }
250 // Failed to resolve class. We must record the errors so that subsequent attempts
251 // to resolve this constant pool entry fail with the same error (JVMS 5.4.3).
252 if (HAS_PENDING_EXCEPTION) {
253 ResourceMark rm;
254 Symbol* error = PENDING_EXCEPTION->klass()->name();
256 bool throw_orig_error = false;
257 {
258 MonitorLockerEx ml(this_oop->lock());
260 // some other thread has beaten us and has resolved the class.
261 if (this_oop->tag_at(which).is_klass()) {
262 CLEAR_PENDING_EXCEPTION;
263 entry = this_oop->resolved_klass_at(which);
264 return entry.get_klass();
265 }
267 if (!PENDING_EXCEPTION->
268 is_a(SystemDictionary::LinkageError_klass())) {
269 // Just throw the exception and don't prevent these classes from
270 // being loaded due to virtual machine errors like StackOverflow
271 // and OutOfMemoryError, etc, or if the thread was hit by stop()
272 // Needs clarification to section 5.4.3 of the VM spec (see 6308271)
273 }
274 else if (!this_oop->tag_at(which).is_unresolved_klass_in_error()) {
275 SystemDictionary::add_resolution_error(this_oop, which, error);
276 this_oop->tag_at_put(which, JVM_CONSTANT_UnresolvedClassInError);
277 } else {
278 // some other thread has put the class in error state.
279 error = SystemDictionary::find_resolution_error(this_oop, which);
280 assert(error != NULL, "checking");
281 throw_orig_error = true;
282 }
283 } // unlocked
285 if (throw_orig_error) {
286 CLEAR_PENDING_EXCEPTION;
287 ResourceMark rm;
288 const char* className = this_oop->unresolved_klass_at(which)->as_C_string();
289 THROW_MSG_0(error, className);
290 }
292 return 0;
293 }
295 if (TraceClassResolution && !k()->oop_is_array()) {
296 // skip resolving the constant pool so that this code get's
297 // called the next time some bytecodes refer to this class.
298 ResourceMark rm;
299 int line_number = -1;
300 const char * source_file = NULL;
301 if (JavaThread::current()->has_last_Java_frame()) {
302 // try to identify the method which called this function.
303 vframeStream vfst(JavaThread::current());
304 if (!vfst.at_end()) {
305 line_number = vfst.method()->line_number_from_bci(vfst.bci());
306 Symbol* s = vfst.method()->method_holder()->source_file_name();
307 if (s != NULL) {
308 source_file = s->as_C_string();
309 }
310 }
311 }
312 if (k() != this_oop->pool_holder()) {
313 // only print something if the classes are different
314 if (source_file != NULL) {
315 tty->print("RESOLVE %s %s %s:%d\n",
316 this_oop->pool_holder()->external_name(),
317 InstanceKlass::cast(k())->external_name(), source_file, line_number);
318 } else {
319 tty->print("RESOLVE %s %s\n",
320 this_oop->pool_holder()->external_name(),
321 InstanceKlass::cast(k())->external_name());
322 }
323 }
324 return k();
325 } else {
326 MonitorLockerEx ml(this_oop->lock());
327 // Only updated constant pool - if it is resolved.
328 do_resolve = this_oop->tag_at(which).is_unresolved_klass();
329 if (do_resolve) {
330 ClassLoaderData* this_key = this_oop->pool_holder()->class_loader_data();
331 this_key->record_dependency(k(), CHECK_NULL); // Can throw OOM
332 this_oop->klass_at_put(which, k());
333 }
334 }
335 }
337 entry = this_oop->resolved_klass_at(which);
338 assert(entry.is_resolved() && entry.get_klass()->is_klass(), "must be resolved at this point");
339 return entry.get_klass();
340 }
343 // Does not update ConstantPool* - to avoid any exception throwing. Used
344 // by compiler and exception handling. Also used to avoid classloads for
345 // instanceof operations. Returns NULL if the class has not been loaded or
346 // if the verification of constant pool failed
347 Klass* ConstantPool::klass_at_if_loaded(constantPoolHandle this_oop, int which) {
348 CPSlot entry = this_oop->slot_at(which);
349 if (entry.is_resolved()) {
350 assert(entry.get_klass()->is_klass(), "must be");
351 return entry.get_klass();
352 } else {
353 assert(entry.is_unresolved(), "must be either symbol or klass");
354 Thread *thread = Thread::current();
355 Symbol* name = entry.get_symbol();
356 oop loader = this_oop->pool_holder()->class_loader();
357 oop protection_domain = this_oop->pool_holder()->protection_domain();
358 Handle h_prot (thread, protection_domain);
359 Handle h_loader (thread, loader);
360 Klass* k = SystemDictionary::find(name, h_loader, h_prot, thread);
362 if (k != NULL) {
363 // Make sure that resolving is legal
364 EXCEPTION_MARK;
365 KlassHandle klass(THREAD, k);
366 // return NULL if verification fails
367 verify_constant_pool_resolve(this_oop, klass, THREAD);
368 if (HAS_PENDING_EXCEPTION) {
369 CLEAR_PENDING_EXCEPTION;
370 return NULL;
371 }
372 return klass();
373 } else {
374 return k;
375 }
376 }
377 }
380 Klass* ConstantPool::klass_ref_at_if_loaded(constantPoolHandle this_oop, int which) {
381 return klass_at_if_loaded(this_oop, this_oop->klass_ref_index_at(which));
382 }
385 // This is an interface for the compiler that allows accessing non-resolved entries
386 // in the constant pool - but still performs the validations tests. Must be used
387 // in a pre-parse of the compiler - to determine what it can do and not do.
388 // Note: We cannot update the ConstantPool from the vm_thread.
389 Klass* ConstantPool::klass_ref_at_if_loaded_check(constantPoolHandle this_oop, int index, TRAPS) {
390 int which = this_oop->klass_ref_index_at(index);
391 CPSlot entry = this_oop->slot_at(which);
392 if (entry.is_resolved()) {
393 assert(entry.get_klass()->is_klass(), "must be");
394 return entry.get_klass();
395 } else {
396 assert(entry.is_unresolved(), "must be either symbol or klass");
397 Symbol* name = entry.get_symbol();
398 oop loader = this_oop->pool_holder()->class_loader();
399 oop protection_domain = this_oop->pool_holder()->protection_domain();
400 Handle h_loader(THREAD, loader);
401 Handle h_prot (THREAD, protection_domain);
402 KlassHandle k(THREAD, SystemDictionary::find(name, h_loader, h_prot, THREAD));
404 // Do access check for klasses
405 if( k.not_null() ) verify_constant_pool_resolve(this_oop, k, CHECK_NULL);
406 return k();
407 }
408 }
411 Method* ConstantPool::method_at_if_loaded(constantPoolHandle cpool,
412 int which) {
413 if (cpool->cache() == NULL) return NULL; // nothing to load yet
414 int cache_index = decode_cpcache_index(which, true);
415 if (!(cache_index >= 0 && cache_index < cpool->cache()->length())) {
416 // FIXME: should be an assert
417 if (PrintMiscellaneous && (Verbose||WizardMode)) {
418 tty->print_cr("bad operand %d in:", which); cpool->print();
419 }
420 return NULL;
421 }
422 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index);
423 return e->method_if_resolved(cpool);
424 }
427 bool ConstantPool::has_appendix_at_if_loaded(constantPoolHandle cpool, int which) {
428 if (cpool->cache() == NULL) return false; // nothing to load yet
429 int cache_index = decode_cpcache_index(which, true);
430 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index);
431 return e->has_appendix();
432 }
434 oop ConstantPool::appendix_at_if_loaded(constantPoolHandle cpool, int which) {
435 if (cpool->cache() == NULL) return NULL; // nothing to load yet
436 int cache_index = decode_cpcache_index(which, true);
437 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index);
438 return e->appendix_if_resolved(cpool);
439 }
442 bool ConstantPool::has_method_type_at_if_loaded(constantPoolHandle cpool, int which) {
443 if (cpool->cache() == NULL) return false; // nothing to load yet
444 int cache_index = decode_cpcache_index(which, true);
445 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index);
446 return e->has_method_type();
447 }
449 oop ConstantPool::method_type_at_if_loaded(constantPoolHandle cpool, int which) {
450 if (cpool->cache() == NULL) return NULL; // nothing to load yet
451 int cache_index = decode_cpcache_index(which, true);
452 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index);
453 return e->method_type_if_resolved(cpool);
454 }
457 Symbol* ConstantPool::impl_name_ref_at(int which, bool uncached) {
458 int name_index = name_ref_index_at(impl_name_and_type_ref_index_at(which, uncached));
459 return symbol_at(name_index);
460 }
463 Symbol* ConstantPool::impl_signature_ref_at(int which, bool uncached) {
464 int signature_index = signature_ref_index_at(impl_name_and_type_ref_index_at(which, uncached));
465 return symbol_at(signature_index);
466 }
469 int ConstantPool::impl_name_and_type_ref_index_at(int which, bool uncached) {
470 int i = which;
471 if (!uncached && cache() != NULL) {
472 if (ConstantPool::is_invokedynamic_index(which)) {
473 // Invokedynamic index is index into resolved_references
474 int pool_index = invokedynamic_cp_cache_entry_at(which)->constant_pool_index();
475 pool_index = invoke_dynamic_name_and_type_ref_index_at(pool_index);
476 assert(tag_at(pool_index).is_name_and_type(), "");
477 return pool_index;
478 }
479 // change byte-ordering and go via cache
480 i = remap_instruction_operand_from_cache(which);
481 } else {
482 if (tag_at(which).is_invoke_dynamic()) {
483 int pool_index = invoke_dynamic_name_and_type_ref_index_at(which);
484 assert(tag_at(pool_index).is_name_and_type(), "");
485 return pool_index;
486 }
487 }
488 assert(tag_at(i).is_field_or_method(), "Corrupted constant pool");
489 assert(!tag_at(i).is_invoke_dynamic(), "Must be handled above");
490 jint ref_index = *int_at_addr(i);
491 return extract_high_short_from_int(ref_index);
492 }
495 int ConstantPool::impl_klass_ref_index_at(int which, bool uncached) {
496 guarantee(!ConstantPool::is_invokedynamic_index(which),
497 "an invokedynamic instruction does not have a klass");
498 int i = which;
499 if (!uncached && cache() != NULL) {
500 // change byte-ordering and go via cache
501 i = remap_instruction_operand_from_cache(which);
502 }
503 assert(tag_at(i).is_field_or_method(), "Corrupted constant pool");
504 jint ref_index = *int_at_addr(i);
505 return extract_low_short_from_int(ref_index);
506 }
510 int ConstantPool::remap_instruction_operand_from_cache(int operand) {
511 int cpc_index = operand;
512 DEBUG_ONLY(cpc_index -= CPCACHE_INDEX_TAG);
513 assert((int)(u2)cpc_index == cpc_index, "clean u2");
514 int member_index = cache()->entry_at(cpc_index)->constant_pool_index();
515 return member_index;
516 }
519 void ConstantPool::verify_constant_pool_resolve(constantPoolHandle this_oop, KlassHandle k, TRAPS) {
520 if (k->oop_is_instance() || k->oop_is_objArray()) {
521 instanceKlassHandle holder (THREAD, this_oop->pool_holder());
522 Klass* elem_oop = k->oop_is_instance() ? k() : ObjArrayKlass::cast(k())->bottom_klass();
523 KlassHandle element (THREAD, elem_oop);
525 // The element type could be a typeArray - we only need the access check if it is
526 // an reference to another class
527 if (element->oop_is_instance()) {
528 LinkResolver::check_klass_accessability(holder, element, CHECK);
529 }
530 }
531 }
534 int ConstantPool::name_ref_index_at(int which_nt) {
535 jint ref_index = name_and_type_at(which_nt);
536 return extract_low_short_from_int(ref_index);
537 }
540 int ConstantPool::signature_ref_index_at(int which_nt) {
541 jint ref_index = name_and_type_at(which_nt);
542 return extract_high_short_from_int(ref_index);
543 }
546 Klass* ConstantPool::klass_ref_at(int which, TRAPS) {
547 return klass_at(klass_ref_index_at(which), CHECK_NULL);
548 }
551 Symbol* ConstantPool::klass_name_at(int which) {
552 assert(tag_at(which).is_unresolved_klass() || tag_at(which).is_klass(),
553 "Corrupted constant pool");
554 // A resolved constantPool entry will contain a Klass*, otherwise a Symbol*.
555 // It is not safe to rely on the tag bit's here, since we don't have a lock, and the entry and
556 // tag is not updated atomicly.
557 CPSlot entry = slot_at(which);
558 if (entry.is_resolved()) {
559 // Already resolved - return entry's name.
560 assert(entry.get_klass()->is_klass(), "must be");
561 return entry.get_klass()->name();
562 } else {
563 assert(entry.is_unresolved(), "must be either symbol or klass");
564 return entry.get_symbol();
565 }
566 }
568 Symbol* ConstantPool::klass_ref_at_noresolve(int which) {
569 jint ref_index = klass_ref_index_at(which);
570 return klass_at_noresolve(ref_index);
571 }
573 Symbol* ConstantPool::uncached_klass_ref_at_noresolve(int which) {
574 jint ref_index = uncached_klass_ref_index_at(which);
575 return klass_at_noresolve(ref_index);
576 }
578 char* ConstantPool::string_at_noresolve(int which) {
579 Symbol* s = unresolved_string_at(which);
580 if (s == NULL) {
581 return (char*)"<pseudo-string>";
582 } else {
583 return unresolved_string_at(which)->as_C_string();
584 }
585 }
587 BasicType ConstantPool::basic_type_for_signature_at(int which) {
588 return FieldType::basic_type(symbol_at(which));
589 }
592 void ConstantPool::resolve_string_constants_impl(constantPoolHandle this_oop, TRAPS) {
593 for (int index = 1; index < this_oop->length(); index++) { // Index 0 is unused
594 if (this_oop->tag_at(index).is_string()) {
595 this_oop->string_at(index, CHECK);
596 }
597 }
598 }
600 // Resolve all the classes in the constant pool. If they are all resolved,
601 // the constant pool is read-only. Enhancement: allocate cp entries to
602 // another metaspace, and copy to read-only or read-write space if this
603 // bit is set.
604 bool ConstantPool::resolve_class_constants(TRAPS) {
605 constantPoolHandle cp(THREAD, this);
606 for (int index = 1; index < length(); index++) { // Index 0 is unused
607 if (tag_at(index).is_unresolved_klass() &&
608 klass_at_if_loaded(cp, index) == NULL) {
609 return false;
610 }
611 }
612 // set_preresolution(); or some bit for future use
613 return true;
614 }
616 // If resolution for MethodHandle or MethodType fails, save the exception
617 // in the resolution error table, so that the same exception is thrown again.
618 void ConstantPool::save_and_throw_exception(constantPoolHandle this_oop, int which,
619 int tag, TRAPS) {
620 ResourceMark rm;
621 Symbol* error = PENDING_EXCEPTION->klass()->name();
622 MonitorLockerEx ml(this_oop->lock()); // lock cpool to change tag.
624 int error_tag = (tag == JVM_CONSTANT_MethodHandle) ?
625 JVM_CONSTANT_MethodHandleInError : JVM_CONSTANT_MethodTypeInError;
627 if (!PENDING_EXCEPTION->
628 is_a(SystemDictionary::LinkageError_klass())) {
629 // Just throw the exception and don't prevent these classes from
630 // being loaded due to virtual machine errors like StackOverflow
631 // and OutOfMemoryError, etc, or if the thread was hit by stop()
632 // Needs clarification to section 5.4.3 of the VM spec (see 6308271)
634 } else if (this_oop->tag_at(which).value() != error_tag) {
635 SystemDictionary::add_resolution_error(this_oop, which, error);
636 this_oop->tag_at_put(which, error_tag);
637 } else {
638 // some other thread has put the class in error state.
639 error = SystemDictionary::find_resolution_error(this_oop, which);
640 assert(error != NULL, "checking");
641 CLEAR_PENDING_EXCEPTION;
642 THROW_MSG(error, "");
643 }
644 }
647 // Called to resolve constants in the constant pool and return an oop.
648 // Some constant pool entries cache their resolved oop. This is also
649 // called to create oops from constants to use in arguments for invokedynamic
650 oop ConstantPool::resolve_constant_at_impl(constantPoolHandle this_oop, int index, int cache_index, TRAPS) {
651 oop result_oop = NULL;
652 Handle throw_exception;
654 if (cache_index == _possible_index_sentinel) {
655 // It is possible that this constant is one which is cached in the objects.
656 // We'll do a linear search. This should be OK because this usage is rare.
657 assert(index > 0, "valid index");
658 cache_index = this_oop->cp_to_object_index(index);
659 }
660 assert(cache_index == _no_index_sentinel || cache_index >= 0, "");
661 assert(index == _no_index_sentinel || index >= 0, "");
663 if (cache_index >= 0) {
664 result_oop = this_oop->resolved_references()->obj_at(cache_index);
665 if (result_oop != NULL) {
666 return result_oop;
667 // That was easy...
668 }
669 index = this_oop->object_to_cp_index(cache_index);
670 }
672 jvalue prim_value; // temp used only in a few cases below
674 int tag_value = this_oop->tag_at(index).value();
676 switch (tag_value) {
678 case JVM_CONSTANT_UnresolvedClass:
679 case JVM_CONSTANT_UnresolvedClassInError:
680 case JVM_CONSTANT_Class:
681 {
682 assert(cache_index == _no_index_sentinel, "should not have been set");
683 Klass* resolved = klass_at_impl(this_oop, index, CHECK_NULL);
684 // ldc wants the java mirror.
685 result_oop = resolved->java_mirror();
686 break;
687 }
689 case JVM_CONSTANT_String:
690 assert(cache_index != _no_index_sentinel, "should have been set");
691 if (this_oop->is_pseudo_string_at(index)) {
692 result_oop = this_oop->pseudo_string_at(index, cache_index);
693 break;
694 }
695 result_oop = string_at_impl(this_oop, index, cache_index, CHECK_NULL);
696 break;
698 case JVM_CONSTANT_Object:
699 result_oop = this_oop->object_at(index);
700 break;
702 case JVM_CONSTANT_MethodHandleInError:
703 case JVM_CONSTANT_MethodTypeInError:
704 {
705 Symbol* error = SystemDictionary::find_resolution_error(this_oop, index);
706 guarantee(error != (Symbol*)NULL, "tag mismatch with resolution error table");
707 ResourceMark rm;
708 THROW_MSG_0(error, "");
709 break;
710 }
712 case JVM_CONSTANT_MethodHandle:
713 {
714 int ref_kind = this_oop->method_handle_ref_kind_at(index);
715 int callee_index = this_oop->method_handle_klass_index_at(index);
716 Symbol* name = this_oop->method_handle_name_ref_at(index);
717 Symbol* signature = this_oop->method_handle_signature_ref_at(index);
718 if (PrintMiscellaneous)
719 tty->print_cr("resolve JVM_CONSTANT_MethodHandle:%d [%d/%d/%d] %s.%s",
720 ref_kind, index, this_oop->method_handle_index_at(index),
721 callee_index, name->as_C_string(), signature->as_C_string());
722 KlassHandle callee;
723 { Klass* k = klass_at_impl(this_oop, callee_index, CHECK_NULL);
724 callee = KlassHandle(THREAD, k);
725 }
726 KlassHandle klass(THREAD, this_oop->pool_holder());
727 Handle value = SystemDictionary::link_method_handle_constant(klass, ref_kind,
728 callee, name, signature,
729 THREAD);
730 result_oop = value();
731 if (HAS_PENDING_EXCEPTION) {
732 save_and_throw_exception(this_oop, index, tag_value, CHECK_NULL);
733 }
734 break;
735 }
737 case JVM_CONSTANT_MethodType:
738 {
739 Symbol* signature = this_oop->method_type_signature_at(index);
740 if (PrintMiscellaneous)
741 tty->print_cr("resolve JVM_CONSTANT_MethodType [%d/%d] %s",
742 index, this_oop->method_type_index_at(index),
743 signature->as_C_string());
744 KlassHandle klass(THREAD, this_oop->pool_holder());
745 Handle value = SystemDictionary::find_method_handle_type(signature, klass, THREAD);
746 result_oop = value();
747 if (HAS_PENDING_EXCEPTION) {
748 save_and_throw_exception(this_oop, index, tag_value, CHECK_NULL);
749 }
750 break;
751 }
753 case JVM_CONSTANT_Integer:
754 assert(cache_index == _no_index_sentinel, "should not have been set");
755 prim_value.i = this_oop->int_at(index);
756 result_oop = java_lang_boxing_object::create(T_INT, &prim_value, CHECK_NULL);
757 break;
759 case JVM_CONSTANT_Float:
760 assert(cache_index == _no_index_sentinel, "should not have been set");
761 prim_value.f = this_oop->float_at(index);
762 result_oop = java_lang_boxing_object::create(T_FLOAT, &prim_value, CHECK_NULL);
763 break;
765 case JVM_CONSTANT_Long:
766 assert(cache_index == _no_index_sentinel, "should not have been set");
767 prim_value.j = this_oop->long_at(index);
768 result_oop = java_lang_boxing_object::create(T_LONG, &prim_value, CHECK_NULL);
769 break;
771 case JVM_CONSTANT_Double:
772 assert(cache_index == _no_index_sentinel, "should not have been set");
773 prim_value.d = this_oop->double_at(index);
774 result_oop = java_lang_boxing_object::create(T_DOUBLE, &prim_value, CHECK_NULL);
775 break;
777 default:
778 DEBUG_ONLY( tty->print_cr("*** %p: tag at CP[%d/%d] = %d",
779 this_oop(), index, cache_index, tag_value) );
780 assert(false, "unexpected constant tag");
781 break;
782 }
784 if (cache_index >= 0) {
785 // Cache the oop here also.
786 Handle result_handle(THREAD, result_oop);
787 MonitorLockerEx ml(this_oop->lock()); // don't know if we really need this
788 oop result = this_oop->resolved_references()->obj_at(cache_index);
789 // Benign race condition: resolved_references may already be filled in while we were trying to lock.
790 // The important thing here is that all threads pick up the same result.
791 // It doesn't matter which racing thread wins, as long as only one
792 // result is used by all threads, and all future queries.
793 // That result may be either a resolved constant or a failure exception.
794 if (result == NULL) {
795 this_oop->resolved_references()->obj_at_put(cache_index, result_handle());
796 return result_handle();
797 } else {
798 // Return the winning thread's result. This can be different than
799 // result_handle() for MethodHandles.
800 return result;
801 }
802 } else {
803 return result_oop;
804 }
805 }
807 oop ConstantPool::uncached_string_at(int which, TRAPS) {
808 Symbol* sym = unresolved_string_at(which);
809 oop str = StringTable::intern(sym, CHECK_(NULL));
810 assert(java_lang_String::is_instance(str), "must be string");
811 return str;
812 }
815 oop ConstantPool::resolve_bootstrap_specifier_at_impl(constantPoolHandle this_oop, int index, TRAPS) {
816 assert(this_oop->tag_at(index).is_invoke_dynamic(), "Corrupted constant pool");
818 Handle bsm;
819 int argc;
820 {
821 // JVM_CONSTANT_InvokeDynamic is an ordered pair of [bootm, name&type], plus optional arguments
822 // The bootm, being a JVM_CONSTANT_MethodHandle, has its own cache entry.
823 // It is accompanied by the optional arguments.
824 int bsm_index = this_oop->invoke_dynamic_bootstrap_method_ref_index_at(index);
825 oop bsm_oop = this_oop->resolve_possibly_cached_constant_at(bsm_index, CHECK_NULL);
826 if (!java_lang_invoke_MethodHandle::is_instance(bsm_oop)) {
827 THROW_MSG_NULL(vmSymbols::java_lang_LinkageError(), "BSM not an MethodHandle");
828 }
830 // Extract the optional static arguments.
831 argc = this_oop->invoke_dynamic_argument_count_at(index);
832 if (argc == 0) return bsm_oop;
834 bsm = Handle(THREAD, bsm_oop);
835 }
837 objArrayHandle info;
838 {
839 objArrayOop info_oop = oopFactory::new_objArray(SystemDictionary::Object_klass(), 1+argc, CHECK_NULL);
840 info = objArrayHandle(THREAD, info_oop);
841 }
843 info->obj_at_put(0, bsm());
844 for (int i = 0; i < argc; i++) {
845 int arg_index = this_oop->invoke_dynamic_argument_index_at(index, i);
846 oop arg_oop = this_oop->resolve_possibly_cached_constant_at(arg_index, CHECK_NULL);
847 info->obj_at_put(1+i, arg_oop);
848 }
850 return info();
851 }
853 oop ConstantPool::string_at_impl(constantPoolHandle this_oop, int which, int obj_index, TRAPS) {
854 // If the string has already been interned, this entry will be non-null
855 oop str = this_oop->resolved_references()->obj_at(obj_index);
856 if (str != NULL) return str;
858 Symbol* sym = this_oop->unresolved_string_at(which);
859 str = StringTable::intern(sym, CHECK_(NULL));
860 this_oop->string_at_put(which, obj_index, str);
861 assert(java_lang_String::is_instance(str), "must be string");
862 return str;
863 }
866 bool ConstantPool::klass_name_at_matches(instanceKlassHandle k,
867 int which) {
868 // Names are interned, so we can compare Symbol*s directly
869 Symbol* cp_name = klass_name_at(which);
870 return (cp_name == k->name());
871 }
874 // Iterate over symbols and decrement ones which are Symbol*s.
875 // This is done during GC so do not need to lock constantPool unless we
876 // have per-thread safepoints.
877 // Only decrement the UTF8 symbols. Unresolved classes and strings point to
878 // these symbols but didn't increment the reference count.
879 void ConstantPool::unreference_symbols() {
880 for (int index = 1; index < length(); index++) { // Index 0 is unused
881 constantTag tag = tag_at(index);
882 if (tag.is_symbol()) {
883 symbol_at(index)->decrement_refcount();
884 }
885 }
886 }
889 // Compare this constant pool's entry at index1 to the constant pool
890 // cp2's entry at index2.
891 bool ConstantPool::compare_entry_to(int index1, constantPoolHandle cp2,
892 int index2, TRAPS) {
894 jbyte t1 = tag_at(index1).value();
895 jbyte t2 = cp2->tag_at(index2).value();
898 // JVM_CONSTANT_UnresolvedClassInError is equal to JVM_CONSTANT_UnresolvedClass
899 // when comparing
900 if (t1 == JVM_CONSTANT_UnresolvedClassInError) {
901 t1 = JVM_CONSTANT_UnresolvedClass;
902 }
903 if (t2 == JVM_CONSTANT_UnresolvedClassInError) {
904 t2 = JVM_CONSTANT_UnresolvedClass;
905 }
907 if (t1 != t2) {
908 // Not the same entry type so there is nothing else to check. Note
909 // that this style of checking will consider resolved/unresolved
910 // class pairs as different.
911 // From the ConstantPool* API point of view, this is correct
912 // behavior. See VM_RedefineClasses::merge_constant_pools() to see how this
913 // plays out in the context of ConstantPool* merging.
914 return false;
915 }
917 switch (t1) {
918 case JVM_CONSTANT_Class:
919 {
920 Klass* k1 = klass_at(index1, CHECK_false);
921 Klass* k2 = cp2->klass_at(index2, CHECK_false);
922 if (k1 == k2) {
923 return true;
924 }
925 } break;
927 case JVM_CONSTANT_ClassIndex:
928 {
929 int recur1 = klass_index_at(index1);
930 int recur2 = cp2->klass_index_at(index2);
931 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
932 if (match) {
933 return true;
934 }
935 } break;
937 case JVM_CONSTANT_Double:
938 {
939 jdouble d1 = double_at(index1);
940 jdouble d2 = cp2->double_at(index2);
941 if (d1 == d2) {
942 return true;
943 }
944 } break;
946 case JVM_CONSTANT_Fieldref:
947 case JVM_CONSTANT_InterfaceMethodref:
948 case JVM_CONSTANT_Methodref:
949 {
950 int recur1 = uncached_klass_ref_index_at(index1);
951 int recur2 = cp2->uncached_klass_ref_index_at(index2);
952 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
953 if (match) {
954 recur1 = uncached_name_and_type_ref_index_at(index1);
955 recur2 = cp2->uncached_name_and_type_ref_index_at(index2);
956 match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
957 if (match) {
958 return true;
959 }
960 }
961 } break;
963 case JVM_CONSTANT_Float:
964 {
965 jfloat f1 = float_at(index1);
966 jfloat f2 = cp2->float_at(index2);
967 if (f1 == f2) {
968 return true;
969 }
970 } break;
972 case JVM_CONSTANT_Integer:
973 {
974 jint i1 = int_at(index1);
975 jint i2 = cp2->int_at(index2);
976 if (i1 == i2) {
977 return true;
978 }
979 } break;
981 case JVM_CONSTANT_Long:
982 {
983 jlong l1 = long_at(index1);
984 jlong l2 = cp2->long_at(index2);
985 if (l1 == l2) {
986 return true;
987 }
988 } break;
990 case JVM_CONSTANT_NameAndType:
991 {
992 int recur1 = name_ref_index_at(index1);
993 int recur2 = cp2->name_ref_index_at(index2);
994 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
995 if (match) {
996 recur1 = signature_ref_index_at(index1);
997 recur2 = cp2->signature_ref_index_at(index2);
998 match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
999 if (match) {
1000 return true;
1001 }
1002 }
1003 } break;
1005 case JVM_CONSTANT_StringIndex:
1006 {
1007 int recur1 = string_index_at(index1);
1008 int recur2 = cp2->string_index_at(index2);
1009 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
1010 if (match) {
1011 return true;
1012 }
1013 } break;
1015 case JVM_CONSTANT_UnresolvedClass:
1016 {
1017 Symbol* k1 = unresolved_klass_at(index1);
1018 Symbol* k2 = cp2->unresolved_klass_at(index2);
1019 if (k1 == k2) {
1020 return true;
1021 }
1022 } break;
1024 case JVM_CONSTANT_MethodType:
1025 {
1026 int k1 = method_type_index_at(index1);
1027 int k2 = cp2->method_type_index_at(index2);
1028 bool match = compare_entry_to(k1, cp2, k2, CHECK_false);
1029 if (match) {
1030 return true;
1031 }
1032 } break;
1034 case JVM_CONSTANT_MethodHandle:
1035 {
1036 int k1 = method_handle_ref_kind_at(index1);
1037 int k2 = cp2->method_handle_ref_kind_at(index2);
1038 if (k1 == k2) {
1039 int i1 = method_handle_index_at(index1);
1040 int i2 = cp2->method_handle_index_at(index2);
1041 bool match = compare_entry_to(i1, cp2, i2, CHECK_false);
1042 if (match) {
1043 return true;
1044 }
1045 }
1046 } break;
1048 case JVM_CONSTANT_InvokeDynamic:
1049 {
1050 int k1 = invoke_dynamic_bootstrap_method_ref_index_at(index1);
1051 int k2 = cp2->invoke_dynamic_bootstrap_method_ref_index_at(index2);
1052 bool match = compare_entry_to(k1, cp2, k2, CHECK_false);
1053 if (!match) return false;
1054 k1 = invoke_dynamic_name_and_type_ref_index_at(index1);
1055 k2 = cp2->invoke_dynamic_name_and_type_ref_index_at(index2);
1056 match = compare_entry_to(k1, cp2, k2, CHECK_false);
1057 if (!match) return false;
1058 int argc = invoke_dynamic_argument_count_at(index1);
1059 if (argc == cp2->invoke_dynamic_argument_count_at(index2)) {
1060 for (int j = 0; j < argc; j++) {
1061 k1 = invoke_dynamic_argument_index_at(index1, j);
1062 k2 = cp2->invoke_dynamic_argument_index_at(index2, j);
1063 match = compare_entry_to(k1, cp2, k2, CHECK_false);
1064 if (!match) return false;
1065 }
1066 return true; // got through loop; all elements equal
1067 }
1068 } break;
1070 case JVM_CONSTANT_String:
1071 {
1072 Symbol* s1 = unresolved_string_at(index1);
1073 Symbol* s2 = cp2->unresolved_string_at(index2);
1074 if (s1 == s2) {
1075 return true;
1076 }
1077 } break;
1079 case JVM_CONSTANT_Utf8:
1080 {
1081 Symbol* s1 = symbol_at(index1);
1082 Symbol* s2 = cp2->symbol_at(index2);
1083 if (s1 == s2) {
1084 return true;
1085 }
1086 } break;
1088 // Invalid is used as the tag for the second constant pool entry
1089 // occupied by JVM_CONSTANT_Double or JVM_CONSTANT_Long. It should
1090 // not be seen by itself.
1091 case JVM_CONSTANT_Invalid: // fall through
1093 default:
1094 ShouldNotReachHere();
1095 break;
1096 }
1098 return false;
1099 } // end compare_entry_to()
1102 void ConstantPool::copy_operands(constantPoolHandle from_cp,
1103 constantPoolHandle to_cp,
1104 TRAPS) {
1106 int from_oplen = operand_array_length(from_cp->operands());
1107 int old_oplen = operand_array_length(to_cp->operands());
1108 if (from_oplen != 0) {
1109 ClassLoaderData* loader_data = to_cp->pool_holder()->class_loader_data();
1110 // append my operands to the target's operands array
1111 if (old_oplen == 0) {
1112 // Can't just reuse from_cp's operand list because of deallocation issues
1113 int len = from_cp->operands()->length();
1114 Array<u2>* new_ops = MetadataFactory::new_array<u2>(loader_data, len, CHECK);
1115 Copy::conjoint_memory_atomic(
1116 from_cp->operands()->adr_at(0), new_ops->adr_at(0), len * sizeof(u2));
1117 to_cp->set_operands(new_ops);
1118 } else {
1119 int old_len = to_cp->operands()->length();
1120 int from_len = from_cp->operands()->length();
1121 int old_off = old_oplen * sizeof(u2);
1122 int from_off = from_oplen * sizeof(u2);
1123 // Use the metaspace for the destination constant pool
1124 Array<u2>* new_operands = MetadataFactory::new_array<u2>(loader_data, old_len + from_len, CHECK);
1125 int fillp = 0, len = 0;
1126 // first part of dest
1127 Copy::conjoint_memory_atomic(to_cp->operands()->adr_at(0),
1128 new_operands->adr_at(fillp),
1129 (len = old_off) * sizeof(u2));
1130 fillp += len;
1131 // first part of src
1132 Copy::conjoint_memory_atomic(from_cp->operands()->adr_at(0),
1133 new_operands->adr_at(fillp),
1134 (len = from_off) * sizeof(u2));
1135 fillp += len;
1136 // second part of dest
1137 Copy::conjoint_memory_atomic(to_cp->operands()->adr_at(old_off),
1138 new_operands->adr_at(fillp),
1139 (len = old_len - old_off) * sizeof(u2));
1140 fillp += len;
1141 // second part of src
1142 Copy::conjoint_memory_atomic(from_cp->operands()->adr_at(from_off),
1143 new_operands->adr_at(fillp),
1144 (len = from_len - from_off) * sizeof(u2));
1145 fillp += len;
1146 assert(fillp == new_operands->length(), "");
1148 // Adjust indexes in the first part of the copied operands array.
1149 for (int j = 0; j < from_oplen; j++) {
1150 int offset = operand_offset_at(new_operands, old_oplen + j);
1151 assert(offset == operand_offset_at(from_cp->operands(), j), "correct copy");
1152 offset += old_len; // every new tuple is preceded by old_len extra u2's
1153 operand_offset_at_put(new_operands, old_oplen + j, offset);
1154 }
1156 // replace target operands array with combined array
1157 to_cp->set_operands(new_operands);
1158 }
1159 }
1160 } // end copy_operands()
1163 // Copy this constant pool's entries at start_i to end_i (inclusive)
1164 // to the constant pool to_cp's entries starting at to_i. A total of
1165 // (end_i - start_i) + 1 entries are copied.
1166 void ConstantPool::copy_cp_to_impl(constantPoolHandle from_cp, int start_i, int end_i,
1167 constantPoolHandle to_cp, int to_i, TRAPS) {
1170 int dest_i = to_i; // leave original alone for debug purposes
1172 for (int src_i = start_i; src_i <= end_i; /* see loop bottom */ ) {
1173 copy_entry_to(from_cp, src_i, to_cp, dest_i, CHECK);
1175 switch (from_cp->tag_at(src_i).value()) {
1176 case JVM_CONSTANT_Double:
1177 case JVM_CONSTANT_Long:
1178 // double and long take two constant pool entries
1179 src_i += 2;
1180 dest_i += 2;
1181 break;
1183 default:
1184 // all others take one constant pool entry
1185 src_i++;
1186 dest_i++;
1187 break;
1188 }
1189 }
1190 copy_operands(from_cp, to_cp, CHECK);
1192 } // end copy_cp_to_impl()
1195 // Copy this constant pool's entry at from_i to the constant pool
1196 // to_cp's entry at to_i.
1197 void ConstantPool::copy_entry_to(constantPoolHandle from_cp, int from_i,
1198 constantPoolHandle to_cp, int to_i,
1199 TRAPS) {
1201 int tag = from_cp->tag_at(from_i).value();
1202 switch (tag) {
1203 case JVM_CONSTANT_Class:
1204 {
1205 Klass* k = from_cp->klass_at(from_i, CHECK);
1206 to_cp->klass_at_put(to_i, k);
1207 } break;
1209 case JVM_CONSTANT_ClassIndex:
1210 {
1211 jint ki = from_cp->klass_index_at(from_i);
1212 to_cp->klass_index_at_put(to_i, ki);
1213 } break;
1215 case JVM_CONSTANT_Double:
1216 {
1217 jdouble d = from_cp->double_at(from_i);
1218 to_cp->double_at_put(to_i, d);
1219 // double takes two constant pool entries so init second entry's tag
1220 to_cp->tag_at_put(to_i + 1, JVM_CONSTANT_Invalid);
1221 } break;
1223 case JVM_CONSTANT_Fieldref:
1224 {
1225 int class_index = from_cp->uncached_klass_ref_index_at(from_i);
1226 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i);
1227 to_cp->field_at_put(to_i, class_index, name_and_type_index);
1228 } break;
1230 case JVM_CONSTANT_Float:
1231 {
1232 jfloat f = from_cp->float_at(from_i);
1233 to_cp->float_at_put(to_i, f);
1234 } break;
1236 case JVM_CONSTANT_Integer:
1237 {
1238 jint i = from_cp->int_at(from_i);
1239 to_cp->int_at_put(to_i, i);
1240 } break;
1242 case JVM_CONSTANT_InterfaceMethodref:
1243 {
1244 int class_index = from_cp->uncached_klass_ref_index_at(from_i);
1245 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i);
1246 to_cp->interface_method_at_put(to_i, class_index, name_and_type_index);
1247 } break;
1249 case JVM_CONSTANT_Long:
1250 {
1251 jlong l = from_cp->long_at(from_i);
1252 to_cp->long_at_put(to_i, l);
1253 // long takes two constant pool entries so init second entry's tag
1254 to_cp->tag_at_put(to_i + 1, JVM_CONSTANT_Invalid);
1255 } break;
1257 case JVM_CONSTANT_Methodref:
1258 {
1259 int class_index = from_cp->uncached_klass_ref_index_at(from_i);
1260 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i);
1261 to_cp->method_at_put(to_i, class_index, name_and_type_index);
1262 } break;
1264 case JVM_CONSTANT_NameAndType:
1265 {
1266 int name_ref_index = from_cp->name_ref_index_at(from_i);
1267 int signature_ref_index = from_cp->signature_ref_index_at(from_i);
1268 to_cp->name_and_type_at_put(to_i, name_ref_index, signature_ref_index);
1269 } break;
1271 case JVM_CONSTANT_StringIndex:
1272 {
1273 jint si = from_cp->string_index_at(from_i);
1274 to_cp->string_index_at_put(to_i, si);
1275 } break;
1277 case JVM_CONSTANT_UnresolvedClass:
1278 {
1279 // Can be resolved after checking tag, so check the slot first.
1280 CPSlot entry = from_cp->slot_at(from_i);
1281 if (entry.is_resolved()) {
1282 assert(entry.get_klass()->is_klass(), "must be");
1283 // Already resolved
1284 to_cp->klass_at_put(to_i, entry.get_klass());
1285 } else {
1286 to_cp->unresolved_klass_at_put(to_i, entry.get_symbol());
1287 }
1288 } break;
1290 case JVM_CONSTANT_UnresolvedClassInError:
1291 {
1292 Symbol* k = from_cp->unresolved_klass_at(from_i);
1293 to_cp->unresolved_klass_at_put(to_i, k);
1294 to_cp->tag_at_put(to_i, JVM_CONSTANT_UnresolvedClassInError);
1295 } break;
1298 case JVM_CONSTANT_String:
1299 {
1300 Symbol* s = from_cp->unresolved_string_at(from_i);
1301 to_cp->unresolved_string_at_put(to_i, s);
1302 } break;
1304 case JVM_CONSTANT_Utf8:
1305 {
1306 Symbol* s = from_cp->symbol_at(from_i);
1307 // Need to increase refcount, the old one will be thrown away and deferenced
1308 s->increment_refcount();
1309 to_cp->symbol_at_put(to_i, s);
1310 } break;
1312 case JVM_CONSTANT_MethodType:
1313 {
1314 jint k = from_cp->method_type_index_at(from_i);
1315 to_cp->method_type_index_at_put(to_i, k);
1316 } break;
1318 case JVM_CONSTANT_MethodHandle:
1319 {
1320 int k1 = from_cp->method_handle_ref_kind_at(from_i);
1321 int k2 = from_cp->method_handle_index_at(from_i);
1322 to_cp->method_handle_index_at_put(to_i, k1, k2);
1323 } break;
1325 case JVM_CONSTANT_InvokeDynamic:
1326 {
1327 int k1 = from_cp->invoke_dynamic_bootstrap_specifier_index(from_i);
1328 int k2 = from_cp->invoke_dynamic_name_and_type_ref_index_at(from_i);
1329 k1 += operand_array_length(to_cp->operands()); // to_cp might already have operands
1330 to_cp->invoke_dynamic_at_put(to_i, k1, k2);
1331 } break;
1333 // Invalid is used as the tag for the second constant pool entry
1334 // occupied by JVM_CONSTANT_Double or JVM_CONSTANT_Long. It should
1335 // not be seen by itself.
1336 case JVM_CONSTANT_Invalid: // fall through
1338 default:
1339 {
1340 ShouldNotReachHere();
1341 } break;
1342 }
1343 } // end copy_entry_to()
1346 // Search constant pool search_cp for an entry that matches this
1347 // constant pool's entry at pattern_i. Returns the index of a
1348 // matching entry or zero (0) if there is no matching entry.
1349 int ConstantPool::find_matching_entry(int pattern_i,
1350 constantPoolHandle search_cp, TRAPS) {
1352 // index zero (0) is not used
1353 for (int i = 1; i < search_cp->length(); i++) {
1354 bool found = compare_entry_to(pattern_i, search_cp, i, CHECK_0);
1355 if (found) {
1356 return i;
1357 }
1358 }
1360 return 0; // entry not found; return unused index zero (0)
1361 } // end find_matching_entry()
1364 #ifndef PRODUCT
1366 const char* ConstantPool::printable_name_at(int which) {
1368 constantTag tag = tag_at(which);
1370 if (tag.is_string()) {
1371 return string_at_noresolve(which);
1372 } else if (tag.is_klass() || tag.is_unresolved_klass()) {
1373 return klass_name_at(which)->as_C_string();
1374 } else if (tag.is_symbol()) {
1375 return symbol_at(which)->as_C_string();
1376 }
1377 return "";
1378 }
1380 #endif // PRODUCT
1383 // JVMTI GetConstantPool support
1385 // For temporary use until code is stable.
1386 #define DBG(code)
1388 static const char* WARN_MSG = "Must not be such entry!";
1390 static void print_cpool_bytes(jint cnt, u1 *bytes) {
1391 jint size = 0;
1392 u2 idx1, idx2;
1394 for (jint idx = 1; idx < cnt; idx++) {
1395 jint ent_size = 0;
1396 u1 tag = *bytes++;
1397 size++; // count tag
1399 printf("const #%03d, tag: %02d ", idx, tag);
1400 switch(tag) {
1401 case JVM_CONSTANT_Invalid: {
1402 printf("Invalid");
1403 break;
1404 }
1405 case JVM_CONSTANT_Unicode: {
1406 printf("Unicode %s", WARN_MSG);
1407 break;
1408 }
1409 case JVM_CONSTANT_Utf8: {
1410 u2 len = Bytes::get_Java_u2(bytes);
1411 char str[128];
1412 if (len > 127) {
1413 len = 127;
1414 }
1415 strncpy(str, (char *) (bytes+2), len);
1416 str[len] = '\0';
1417 printf("Utf8 \"%s\"", str);
1418 ent_size = 2 + len;
1419 break;
1420 }
1421 case JVM_CONSTANT_Integer: {
1422 u4 val = Bytes::get_Java_u4(bytes);
1423 printf("int %d", *(int *) &val);
1424 ent_size = 4;
1425 break;
1426 }
1427 case JVM_CONSTANT_Float: {
1428 u4 val = Bytes::get_Java_u4(bytes);
1429 printf("float %5.3ff", *(float *) &val);
1430 ent_size = 4;
1431 break;
1432 }
1433 case JVM_CONSTANT_Long: {
1434 u8 val = Bytes::get_Java_u8(bytes);
1435 printf("long "INT64_FORMAT, (int64_t) *(jlong *) &val);
1436 ent_size = 8;
1437 idx++; // Long takes two cpool slots
1438 break;
1439 }
1440 case JVM_CONSTANT_Double: {
1441 u8 val = Bytes::get_Java_u8(bytes);
1442 printf("double %5.3fd", *(jdouble *)&val);
1443 ent_size = 8;
1444 idx++; // Double takes two cpool slots
1445 break;
1446 }
1447 case JVM_CONSTANT_Class: {
1448 idx1 = Bytes::get_Java_u2(bytes);
1449 printf("class #%03d", idx1);
1450 ent_size = 2;
1451 break;
1452 }
1453 case JVM_CONSTANT_String: {
1454 idx1 = Bytes::get_Java_u2(bytes);
1455 printf("String #%03d", idx1);
1456 ent_size = 2;
1457 break;
1458 }
1459 case JVM_CONSTANT_Fieldref: {
1460 idx1 = Bytes::get_Java_u2(bytes);
1461 idx2 = Bytes::get_Java_u2(bytes+2);
1462 printf("Field #%03d, #%03d", (int) idx1, (int) idx2);
1463 ent_size = 4;
1464 break;
1465 }
1466 case JVM_CONSTANT_Methodref: {
1467 idx1 = Bytes::get_Java_u2(bytes);
1468 idx2 = Bytes::get_Java_u2(bytes+2);
1469 printf("Method #%03d, #%03d", idx1, idx2);
1470 ent_size = 4;
1471 break;
1472 }
1473 case JVM_CONSTANT_InterfaceMethodref: {
1474 idx1 = Bytes::get_Java_u2(bytes);
1475 idx2 = Bytes::get_Java_u2(bytes+2);
1476 printf("InterfMethod #%03d, #%03d", idx1, idx2);
1477 ent_size = 4;
1478 break;
1479 }
1480 case JVM_CONSTANT_NameAndType: {
1481 idx1 = Bytes::get_Java_u2(bytes);
1482 idx2 = Bytes::get_Java_u2(bytes+2);
1483 printf("NameAndType #%03d, #%03d", idx1, idx2);
1484 ent_size = 4;
1485 break;
1486 }
1487 case JVM_CONSTANT_ClassIndex: {
1488 printf("ClassIndex %s", WARN_MSG);
1489 break;
1490 }
1491 case JVM_CONSTANT_UnresolvedClass: {
1492 printf("UnresolvedClass: %s", WARN_MSG);
1493 break;
1494 }
1495 case JVM_CONSTANT_UnresolvedClassInError: {
1496 printf("UnresolvedClassInErr: %s", WARN_MSG);
1497 break;
1498 }
1499 case JVM_CONSTANT_StringIndex: {
1500 printf("StringIndex: %s", WARN_MSG);
1501 break;
1502 }
1503 }
1504 printf(";\n");
1505 bytes += ent_size;
1506 size += ent_size;
1507 }
1508 printf("Cpool size: %d\n", size);
1509 fflush(0);
1510 return;
1511 } /* end print_cpool_bytes */
1514 // Returns size of constant pool entry.
1515 jint ConstantPool::cpool_entry_size(jint idx) {
1516 switch(tag_at(idx).value()) {
1517 case JVM_CONSTANT_Invalid:
1518 case JVM_CONSTANT_Unicode:
1519 return 1;
1521 case JVM_CONSTANT_Utf8:
1522 return 3 + symbol_at(idx)->utf8_length();
1524 case JVM_CONSTANT_Class:
1525 case JVM_CONSTANT_String:
1526 case JVM_CONSTANT_ClassIndex:
1527 case JVM_CONSTANT_UnresolvedClass:
1528 case JVM_CONSTANT_UnresolvedClassInError:
1529 case JVM_CONSTANT_StringIndex:
1530 case JVM_CONSTANT_MethodType:
1531 return 3;
1533 case JVM_CONSTANT_MethodHandle:
1534 return 4; //tag, ref_kind, ref_index
1536 case JVM_CONSTANT_Integer:
1537 case JVM_CONSTANT_Float:
1538 case JVM_CONSTANT_Fieldref:
1539 case JVM_CONSTANT_Methodref:
1540 case JVM_CONSTANT_InterfaceMethodref:
1541 case JVM_CONSTANT_NameAndType:
1542 return 5;
1544 case JVM_CONSTANT_InvokeDynamic:
1545 // u1 tag, u2 bsm, u2 nt
1546 return 5;
1548 case JVM_CONSTANT_Long:
1549 case JVM_CONSTANT_Double:
1550 return 9;
1551 }
1552 assert(false, "cpool_entry_size: Invalid constant pool entry tag");
1553 return 1;
1554 } /* end cpool_entry_size */
1557 // SymbolHashMap is used to find a constant pool index from a string.
1558 // This function fills in SymbolHashMaps, one for utf8s and one for
1559 // class names, returns size of the cpool raw bytes.
1560 jint ConstantPool::hash_entries_to(SymbolHashMap *symmap,
1561 SymbolHashMap *classmap) {
1562 jint size = 0;
1564 for (u2 idx = 1; idx < length(); idx++) {
1565 u2 tag = tag_at(idx).value();
1566 size += cpool_entry_size(idx);
1568 switch(tag) {
1569 case JVM_CONSTANT_Utf8: {
1570 Symbol* sym = symbol_at(idx);
1571 symmap->add_entry(sym, idx);
1572 DBG(printf("adding symbol entry %s = %d\n", sym->as_utf8(), idx));
1573 break;
1574 }
1575 case JVM_CONSTANT_Class:
1576 case JVM_CONSTANT_UnresolvedClass:
1577 case JVM_CONSTANT_UnresolvedClassInError: {
1578 Symbol* sym = klass_name_at(idx);
1579 classmap->add_entry(sym, idx);
1580 DBG(printf("adding class entry %s = %d\n", sym->as_utf8(), idx));
1581 break;
1582 }
1583 case JVM_CONSTANT_Long:
1584 case JVM_CONSTANT_Double: {
1585 idx++; // Both Long and Double take two cpool slots
1586 break;
1587 }
1588 }
1589 }
1590 return size;
1591 } /* end hash_utf8_entries_to */
1594 // Copy cpool bytes.
1595 // Returns:
1596 // 0, in case of OutOfMemoryError
1597 // -1, in case of internal error
1598 // > 0, count of the raw cpool bytes that have been copied
1599 int ConstantPool::copy_cpool_bytes(int cpool_size,
1600 SymbolHashMap* tbl,
1601 unsigned char *bytes) {
1602 u2 idx1, idx2;
1603 jint size = 0;
1604 jint cnt = length();
1605 unsigned char *start_bytes = bytes;
1607 for (jint idx = 1; idx < cnt; idx++) {
1608 u1 tag = tag_at(idx).value();
1609 jint ent_size = cpool_entry_size(idx);
1611 assert(size + ent_size <= cpool_size, "Size mismatch");
1613 *bytes = tag;
1614 DBG(printf("#%03hd tag=%03hd, ", idx, tag));
1615 switch(tag) {
1616 case JVM_CONSTANT_Invalid: {
1617 DBG(printf("JVM_CONSTANT_Invalid"));
1618 break;
1619 }
1620 case JVM_CONSTANT_Unicode: {
1621 assert(false, "Wrong constant pool tag: JVM_CONSTANT_Unicode");
1622 DBG(printf("JVM_CONSTANT_Unicode"));
1623 break;
1624 }
1625 case JVM_CONSTANT_Utf8: {
1626 Symbol* sym = symbol_at(idx);
1627 char* str = sym->as_utf8();
1628 // Warning! It's crashing on x86 with len = sym->utf8_length()
1629 int len = (int) strlen(str);
1630 Bytes::put_Java_u2((address) (bytes+1), (u2) len);
1631 for (int i = 0; i < len; i++) {
1632 bytes[3+i] = (u1) str[i];
1633 }
1634 DBG(printf("JVM_CONSTANT_Utf8: %s ", str));
1635 break;
1636 }
1637 case JVM_CONSTANT_Integer: {
1638 jint val = int_at(idx);
1639 Bytes::put_Java_u4((address) (bytes+1), *(u4*)&val);
1640 break;
1641 }
1642 case JVM_CONSTANT_Float: {
1643 jfloat val = float_at(idx);
1644 Bytes::put_Java_u4((address) (bytes+1), *(u4*)&val);
1645 break;
1646 }
1647 case JVM_CONSTANT_Long: {
1648 jlong val = long_at(idx);
1649 Bytes::put_Java_u8((address) (bytes+1), *(u8*)&val);
1650 idx++; // Long takes two cpool slots
1651 break;
1652 }
1653 case JVM_CONSTANT_Double: {
1654 jdouble val = double_at(idx);
1655 Bytes::put_Java_u8((address) (bytes+1), *(u8*)&val);
1656 idx++; // Double takes two cpool slots
1657 break;
1658 }
1659 case JVM_CONSTANT_Class:
1660 case JVM_CONSTANT_UnresolvedClass:
1661 case JVM_CONSTANT_UnresolvedClassInError: {
1662 *bytes = JVM_CONSTANT_Class;
1663 Symbol* sym = klass_name_at(idx);
1664 idx1 = tbl->symbol_to_value(sym);
1665 assert(idx1 != 0, "Have not found a hashtable entry");
1666 Bytes::put_Java_u2((address) (bytes+1), idx1);
1667 DBG(printf("JVM_CONSTANT_Class: idx=#%03hd, %s", idx1, sym->as_utf8()));
1668 break;
1669 }
1670 case JVM_CONSTANT_String: {
1671 *bytes = JVM_CONSTANT_String;
1672 Symbol* sym = unresolved_string_at(idx);
1673 idx1 = tbl->symbol_to_value(sym);
1674 assert(idx1 != 0, "Have not found a hashtable entry");
1675 Bytes::put_Java_u2((address) (bytes+1), idx1);
1676 DBG(char *str = sym->as_utf8());
1677 DBG(printf("JVM_CONSTANT_String: idx=#%03hd, %s", idx1, str));
1678 break;
1679 }
1680 case JVM_CONSTANT_Fieldref:
1681 case JVM_CONSTANT_Methodref:
1682 case JVM_CONSTANT_InterfaceMethodref: {
1683 idx1 = uncached_klass_ref_index_at(idx);
1684 idx2 = uncached_name_and_type_ref_index_at(idx);
1685 Bytes::put_Java_u2((address) (bytes+1), idx1);
1686 Bytes::put_Java_u2((address) (bytes+3), idx2);
1687 DBG(printf("JVM_CONSTANT_Methodref: %hd %hd", idx1, idx2));
1688 break;
1689 }
1690 case JVM_CONSTANT_NameAndType: {
1691 idx1 = name_ref_index_at(idx);
1692 idx2 = signature_ref_index_at(idx);
1693 Bytes::put_Java_u2((address) (bytes+1), idx1);
1694 Bytes::put_Java_u2((address) (bytes+3), idx2);
1695 DBG(printf("JVM_CONSTANT_NameAndType: %hd %hd", idx1, idx2));
1696 break;
1697 }
1698 case JVM_CONSTANT_ClassIndex: {
1699 *bytes = JVM_CONSTANT_Class;
1700 idx1 = klass_index_at(idx);
1701 Bytes::put_Java_u2((address) (bytes+1), idx1);
1702 DBG(printf("JVM_CONSTANT_ClassIndex: %hd", idx1));
1703 break;
1704 }
1705 case JVM_CONSTANT_StringIndex: {
1706 *bytes = JVM_CONSTANT_String;
1707 idx1 = string_index_at(idx);
1708 Bytes::put_Java_u2((address) (bytes+1), idx1);
1709 DBG(printf("JVM_CONSTANT_StringIndex: %hd", idx1));
1710 break;
1711 }
1712 case JVM_CONSTANT_MethodHandle:
1713 case JVM_CONSTANT_MethodHandleInError: {
1714 *bytes = JVM_CONSTANT_MethodHandle;
1715 int kind = method_handle_ref_kind_at(idx);
1716 idx1 = method_handle_index_at(idx);
1717 *(bytes+1) = (unsigned char) kind;
1718 Bytes::put_Java_u2((address) (bytes+2), idx1);
1719 DBG(printf("JVM_CONSTANT_MethodHandle: %d %hd", kind, idx1));
1720 break;
1721 }
1722 case JVM_CONSTANT_MethodType:
1723 case JVM_CONSTANT_MethodTypeInError: {
1724 *bytes = JVM_CONSTANT_MethodType;
1725 idx1 = method_type_index_at(idx);
1726 Bytes::put_Java_u2((address) (bytes+1), idx1);
1727 DBG(printf("JVM_CONSTANT_MethodType: %hd", idx1));
1728 break;
1729 }
1730 case JVM_CONSTANT_InvokeDynamic: {
1731 *bytes = tag;
1732 idx1 = extract_low_short_from_int(*int_at_addr(idx));
1733 idx2 = extract_high_short_from_int(*int_at_addr(idx));
1734 assert(idx2 == invoke_dynamic_name_and_type_ref_index_at(idx), "correct half of u4");
1735 Bytes::put_Java_u2((address) (bytes+1), idx1);
1736 Bytes::put_Java_u2((address) (bytes+3), idx2);
1737 DBG(printf("JVM_CONSTANT_InvokeDynamic: %hd %hd", idx1, idx2));
1738 break;
1739 }
1740 }
1741 DBG(printf("\n"));
1742 bytes += ent_size;
1743 size += ent_size;
1744 }
1745 assert(size == cpool_size, "Size mismatch");
1747 // Keep temorarily for debugging until it's stable.
1748 DBG(print_cpool_bytes(cnt, start_bytes));
1749 return (int)(bytes - start_bytes);
1750 } /* end copy_cpool_bytes */
1753 void ConstantPool::set_on_stack(const bool value) {
1754 if (value) {
1755 _flags |= _on_stack;
1756 } else {
1757 _flags &= ~_on_stack;
1758 }
1759 if (value) MetadataOnStackMark::record(this);
1760 }
1762 // JSR 292 support for patching constant pool oops after the class is linked and
1763 // the oop array for resolved references are created.
1764 // We can't do this during classfile parsing, which is how the other indexes are
1765 // patched. The other patches are applied early for some error checking
1766 // so only defer the pseudo_strings.
1767 void ConstantPool::patch_resolved_references(
1768 GrowableArray<Handle>* cp_patches) {
1769 assert(EnableInvokeDynamic, "");
1770 for (int index = 1; index < cp_patches->length(); index++) { // Index 0 is unused
1771 Handle patch = cp_patches->at(index);
1772 if (patch.not_null()) {
1773 assert (tag_at(index).is_string(), "should only be string left");
1774 // Patching a string means pre-resolving it.
1775 // The spelling in the constant pool is ignored.
1776 // The constant reference may be any object whatever.
1777 // If it is not a real interned string, the constant is referred
1778 // to as a "pseudo-string", and must be presented to the CP
1779 // explicitly, because it may require scavenging.
1780 int obj_index = cp_to_object_index(index);
1781 pseudo_string_at_put(index, obj_index, patch());
1782 DEBUG_ONLY(cp_patches->at_put(index, Handle());)
1783 }
1784 }
1785 #ifdef ASSERT
1786 // Ensure that all the patches have been used.
1787 for (int index = 0; index < cp_patches->length(); index++) {
1788 assert(cp_patches->at(index).is_null(),
1789 err_msg("Unused constant pool patch at %d in class file %s",
1790 index,
1791 pool_holder()->external_name()));
1792 }
1793 #endif // ASSERT
1794 }
1796 #ifndef PRODUCT
1798 // CompileTheWorld support. Preload all classes loaded references in the passed in constantpool
1799 void ConstantPool::preload_and_initialize_all_classes(ConstantPool* obj, TRAPS) {
1800 guarantee(obj->is_constantPool(), "object must be constant pool");
1801 constantPoolHandle cp(THREAD, (ConstantPool*)obj);
1802 guarantee(cp->pool_holder() != NULL, "must be fully loaded");
1804 for (int i = 0; i< cp->length(); i++) {
1805 if (cp->tag_at(i).is_unresolved_klass()) {
1806 // This will force loading of the class
1807 Klass* klass = cp->klass_at(i, CHECK);
1808 if (klass->oop_is_instance()) {
1809 // Force initialization of class
1810 InstanceKlass::cast(klass)->initialize(CHECK);
1811 }
1812 }
1813 }
1814 }
1816 #endif
1819 // Printing
1821 void ConstantPool::print_on(outputStream* st) const {
1822 EXCEPTION_MARK;
1823 assert(is_constantPool(), "must be constantPool");
1824 st->print_cr(internal_name());
1825 if (flags() != 0) {
1826 st->print(" - flags: 0x%x", flags());
1827 if (has_pseudo_string()) st->print(" has_pseudo_string");
1828 if (has_invokedynamic()) st->print(" has_invokedynamic");
1829 if (has_preresolution()) st->print(" has_preresolution");
1830 if (on_stack()) st->print(" on_stack");
1831 st->cr();
1832 }
1833 if (pool_holder() != NULL) {
1834 st->print_cr(" - holder: " INTPTR_FORMAT, pool_holder());
1835 }
1836 st->print_cr(" - cache: " INTPTR_FORMAT, cache());
1837 st->print_cr(" - resolved_references: " INTPTR_FORMAT, resolved_references());
1838 st->print_cr(" - reference_map: " INTPTR_FORMAT, reference_map());
1840 for (int index = 1; index < length(); index++) { // Index 0 is unused
1841 ((ConstantPool*)this)->print_entry_on(index, st);
1842 switch (tag_at(index).value()) {
1843 case JVM_CONSTANT_Long :
1844 case JVM_CONSTANT_Double :
1845 index++; // Skip entry following eigth-byte constant
1846 }
1848 }
1849 st->cr();
1850 }
1852 // Print one constant pool entry
1853 void ConstantPool::print_entry_on(const int index, outputStream* st) {
1854 EXCEPTION_MARK;
1855 st->print(" - %3d : ", index);
1856 tag_at(index).print_on(st);
1857 st->print(" : ");
1858 switch (tag_at(index).value()) {
1859 case JVM_CONSTANT_Class :
1860 { Klass* k = klass_at(index, CATCH);
1861 k->print_value_on(st);
1862 st->print(" {0x%lx}", (address)k);
1863 }
1864 break;
1865 case JVM_CONSTANT_Fieldref :
1866 case JVM_CONSTANT_Methodref :
1867 case JVM_CONSTANT_InterfaceMethodref :
1868 st->print("klass_index=%d", uncached_klass_ref_index_at(index));
1869 st->print(" name_and_type_index=%d", uncached_name_and_type_ref_index_at(index));
1870 break;
1871 case JVM_CONSTANT_String :
1872 unresolved_string_at(index)->print_value_on(st);
1873 break;
1874 case JVM_CONSTANT_Object : {
1875 oop anObj = object_at(index);
1876 anObj->print_value_on(st);
1877 st->print(" {0x%lx}", (address)anObj);
1878 } break;
1879 case JVM_CONSTANT_Integer :
1880 st->print("%d", int_at(index));
1881 break;
1882 case JVM_CONSTANT_Float :
1883 st->print("%f", float_at(index));
1884 break;
1885 case JVM_CONSTANT_Long :
1886 st->print_jlong(long_at(index));
1887 break;
1888 case JVM_CONSTANT_Double :
1889 st->print("%lf", double_at(index));
1890 break;
1891 case JVM_CONSTANT_NameAndType :
1892 st->print("name_index=%d", name_ref_index_at(index));
1893 st->print(" signature_index=%d", signature_ref_index_at(index));
1894 break;
1895 case JVM_CONSTANT_Utf8 :
1896 symbol_at(index)->print_value_on(st);
1897 break;
1898 case JVM_CONSTANT_UnresolvedClass : // fall-through
1899 case JVM_CONSTANT_UnresolvedClassInError: {
1900 // unresolved_klass_at requires lock or safe world.
1901 CPSlot entry = slot_at(index);
1902 if (entry.is_resolved()) {
1903 entry.get_klass()->print_value_on(st);
1904 } else {
1905 entry.get_symbol()->print_value_on(st);
1906 }
1907 }
1908 break;
1909 case JVM_CONSTANT_MethodHandle :
1910 case JVM_CONSTANT_MethodHandleInError :
1911 st->print("ref_kind=%d", method_handle_ref_kind_at(index));
1912 st->print(" ref_index=%d", method_handle_index_at(index));
1913 break;
1914 case JVM_CONSTANT_MethodType :
1915 case JVM_CONSTANT_MethodTypeInError :
1916 st->print("signature_index=%d", method_type_index_at(index));
1917 break;
1918 case JVM_CONSTANT_InvokeDynamic :
1919 {
1920 st->print("bootstrap_method_index=%d", invoke_dynamic_bootstrap_method_ref_index_at(index));
1921 st->print(" name_and_type_index=%d", invoke_dynamic_name_and_type_ref_index_at(index));
1922 int argc = invoke_dynamic_argument_count_at(index);
1923 if (argc > 0) {
1924 for (int arg_i = 0; arg_i < argc; arg_i++) {
1925 int arg = invoke_dynamic_argument_index_at(index, arg_i);
1926 st->print((arg_i == 0 ? " arguments={%d" : ", %d"), arg);
1927 }
1928 st->print("}");
1929 }
1930 }
1931 break;
1932 default:
1933 ShouldNotReachHere();
1934 break;
1935 }
1936 st->cr();
1937 }
1939 void ConstantPool::print_value_on(outputStream* st) const {
1940 assert(is_constantPool(), "must be constantPool");
1941 st->print("constant pool [%d]", length());
1942 if (has_pseudo_string()) st->print("/pseudo_string");
1943 if (has_invokedynamic()) st->print("/invokedynamic");
1944 if (has_preresolution()) st->print("/preresolution");
1945 if (operands() != NULL) st->print("/operands[%d]", operands()->length());
1946 print_address_on(st);
1947 st->print(" for ");
1948 pool_holder()->print_value_on(st);
1949 if (pool_holder() != NULL) {
1950 bool extra = (pool_holder()->constants() != this);
1951 if (extra) st->print(" (extra)");
1952 }
1953 if (cache() != NULL) {
1954 st->print(" cache=" PTR_FORMAT, cache());
1955 }
1956 }
1958 #if INCLUDE_SERVICES
1959 // Size Statistics
1960 void ConstantPool::collect_statistics(KlassSizeStats *sz) const {
1961 sz->_cp_all_bytes += (sz->_cp_bytes = sz->count(this));
1962 sz->_cp_all_bytes += (sz->_cp_tags_bytes = sz->count_array(tags()));
1963 sz->_cp_all_bytes += (sz->_cp_cache_bytes = sz->count(cache()));
1964 sz->_cp_all_bytes += (sz->_cp_operands_bytes = sz->count_array(operands()));
1965 sz->_cp_all_bytes += (sz->_cp_refmap_bytes = sz->count_array(reference_map()));
1967 sz->_ro_bytes += sz->_cp_operands_bytes + sz->_cp_tags_bytes +
1968 sz->_cp_refmap_bytes;
1969 sz->_rw_bytes += sz->_cp_bytes + sz->_cp_cache_bytes;
1970 }
1971 #endif // INCLUDE_SERVICES
1973 // Verification
1975 void ConstantPool::verify_on(outputStream* st) {
1976 guarantee(is_constantPool(), "object must be constant pool");
1977 for (int i = 0; i< length(); i++) {
1978 constantTag tag = tag_at(i);
1979 CPSlot entry = slot_at(i);
1980 if (tag.is_klass()) {
1981 if (entry.is_resolved()) {
1982 guarantee(entry.get_klass()->is_metadata(), "should be metadata");
1983 guarantee(entry.get_klass()->is_klass(), "should be klass");
1984 }
1985 } else if (tag.is_unresolved_klass()) {
1986 if (entry.is_resolved()) {
1987 guarantee(entry.get_klass()->is_metadata(), "should be metadata");
1988 guarantee(entry.get_klass()->is_klass(), "should be klass");
1989 }
1990 } else if (tag.is_symbol()) {
1991 guarantee(entry.get_symbol()->refcount() != 0, "should have nonzero reference count");
1992 } else if (tag.is_string()) {
1993 guarantee(entry.get_symbol()->refcount() != 0, "should have nonzero reference count");
1994 }
1995 }
1996 if (cache() != NULL) {
1997 // Note: cache() can be NULL before a class is completely setup or
1998 // in temporary constant pools used during constant pool merging
1999 guarantee(cache()->is_metadata(), "should be metadata");
2000 guarantee(cache()->is_constantPoolCache(), "should be constant pool cache");
2001 }
2002 if (pool_holder() != NULL) {
2003 // Note: pool_holder() can be NULL in temporary constant pools
2004 // used during constant pool merging
2005 guarantee(pool_holder()->is_metadata(), "should be metadata");
2006 guarantee(pool_holder()->is_klass(), "should be klass");
2007 }
2008 }
2011 void SymbolHashMap::add_entry(Symbol* sym, u2 value) {
2012 char *str = sym->as_utf8();
2013 unsigned int hash = compute_hash(str, sym->utf8_length());
2014 unsigned int index = hash % table_size();
2016 // check if already in map
2017 // we prefer the first entry since it is more likely to be what was used in
2018 // the class file
2019 for (SymbolHashMapEntry *en = bucket(index); en != NULL; en = en->next()) {
2020 assert(en->symbol() != NULL, "SymbolHashMapEntry symbol is NULL");
2021 if (en->hash() == hash && en->symbol() == sym) {
2022 return; // already there
2023 }
2024 }
2026 SymbolHashMapEntry* entry = new SymbolHashMapEntry(hash, sym, value);
2027 entry->set_next(bucket(index));
2028 _buckets[index].set_entry(entry);
2029 assert(entry->symbol() != NULL, "SymbolHashMapEntry symbol is NULL");
2030 }
2032 SymbolHashMapEntry* SymbolHashMap::find_entry(Symbol* sym) {
2033 assert(sym != NULL, "SymbolHashMap::find_entry - symbol is NULL");
2034 char *str = sym->as_utf8();
2035 int len = sym->utf8_length();
2036 unsigned int hash = SymbolHashMap::compute_hash(str, len);
2037 unsigned int index = hash % table_size();
2038 for (SymbolHashMapEntry *en = bucket(index); en != NULL; en = en->next()) {
2039 assert(en->symbol() != NULL, "SymbolHashMapEntry symbol is NULL");
2040 if (en->hash() == hash && en->symbol() == sym) {
2041 return en;
2042 }
2043 }
2044 return NULL;
2045 }